Convert Gigawatts (GW) to Milliwatts (mW)

1 gigawatt equals 1 × 10¹² milliwatts.

Formula: mW = GW × 1 × 10¹²

Gigawatt to Milliwatt Converter

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How to Convert Gigawatt to Milliwatt

1 gigawatt = 1 × 1012 milliwatts

Milliwatt = Gigawatt × 1 × 1012

Example: 1 GW × 1 × 1012 = 1 × 1012 mW

Reverse Conversion

To convert milliwatts back to gigawatts:

  • Remember, 1 milliwatt equals 1 × 10-12 gigawatts.
  • To convert 1 × 1012 mW to GW, multiply 1 × 1012 x 1 × 10-12, resulting in 1 GW.

Common Gigawatt to Milliwatt Conversions

Gigawatt to Milliwatt (Part 1)
Gigawatt to Milliwatt common conversions part 1
Gigawatt Milliwatt Actions
1 gigawatt 1 × 1012 milliwatts
5 gigawatts 5 × 1012 milliwatts
10 gigawatts 1 × 1013 milliwatts
25 gigawatts 2.5 × 1013 milliwatts
Gigawatt to Milliwatt (Part 2)
Gigawatt to Milliwatt common conversions part 2
Gigawatt Milliwatt Actions
50 gigawatts 5 × 1013 milliwatts
100 gigawatts 1 × 1014 milliwatts
500 gigawatts 5 × 1014 milliwatts
1000 gigawatts 1 × 1015 milliwatts

Gigawatts to milliwatts Conversion Table

Reference table with common gigawatts to milliwatts conversions. All values calculated with high precision.

Gigawatts to Milliwatts Table
0.0001 to 12

Gigawatts Milliwatts Actions
0.0001 GW 1 × 108 mW
0.00025 GW 2.5 × 108 mW
0.0005 GW 5 × 108 mW
0.001 GW 1 × 109 mW
0.0025 GW 2.5 × 109 mW
0.005 GW 5 × 109 mW
0.01 GW 1 × 1010 mW
0.025 GW 2.5 × 1010 mW
0.05 GW 5 × 1010 mW
0.1 GW 1 × 1011 mW
14 GW 2.5 × 1011 mW
12 GW 5 × 1011 mW

Gigawatts to Milliwatts Table
1 to 100000

Gigawatts Milliwatts Actions
1 GW 1 × 1012 mW
2 12 GW 2.5 × 1012 mW
5 GW 5 × 1012 mW
10 GW 1 × 1013 mW
25 GW 2.5 × 1013 mW
50 GW 5 × 1013 mW
100 GW 1 × 1014 mW
250 GW 2.5 × 1014 mW
500 GW 5 × 1014 mW
1000 GW 1 × 1015 mW
2500 GW 2.5 × 1015 mW
5000 GW 5 × 1015 mW
10000 GW 1 × 1016 mW
25000 GW 2.5 × 1016 mW
50000 GW 5 × 1016 mW
100000 GW 1 × 1017 mW

Milliwatts to Gigawatts Table
10000 to 5 × 107

Milliwatts Gigawatts Actions
10000 mW 1 × 10-8 GW
25000 mW 2.5 × 10-8 GW
50000 mW 5 × 10-8 GW
100000 mW 1 × 10-7 GW
250000 mW 2.5 × 10-7 GW
500000 mW 5 × 10-7 GW
1000000 mW 1 × 10-6 GW
2500000 mW 2.5 × 10-6 GW
5000000 mW 5 × 10-6 GW
10000000 mW 1 × 10-5 GW
2.5 × 107 mW 2.5 × 10-5 GW
5 × 107 mW 5 × 10-5 GW

Milliwatts to Gigawatts Table
1 × 108 to 1 × 1013

Milliwatts Gigawatts Actions
1 × 108 mW 0.0001 GW
2.5 × 108 mW 0.00025 GW
5 × 108 mW 0.0005 GW
1 × 109 mW 0.001 GW
2.5 × 109 mW 0.0025 GW
5 × 109 mW 0.005 GW
1 × 1010 mW 0.01 GW
2.5 × 1010 mW 0.025 GW
5 × 1010 mW 0.05 GW
1 × 1011 mW 0.1 GW
2.5 × 1011 mW 14 GW
5 × 1011 mW 12 GW
1 × 1012 mW 1 GW
2.5 × 1012 mW 2 12 GW
5 × 1012 mW 5 GW
1 × 1013 mW 10 GW

Definition of Gigawatt

Definition
SI multiple of the watt equal to one billion watts.
Exact factor
1 GW = 10⁹ W
Sources
BIPM — SI Brochure

Definition of Milliwatt

Definition
SI multiple equal to one thousandth of a watt.
Exact factor
1 mW = 10⁻³ W
Sources
BIPM — SI Brochure

Frequently Asked Questions

How many milliwatts are in one gigawatt?

One gigawatt equals 1 × 1012 milliwatts. To convert, multiply the gigawatt value by 1 × 1012. For the reverse, divide the milliwatt value by 1 × 1012 (or multiply by 1 × 10-12).

What is 1.21 gigawatts in milliwatts?

1.21 gigawatts = 1.21 × 1012 milliwatts. This is one of the most commonly searched conversions for this pair.

How precise is the gigawatt-to-milliwatt conversion?

The factor 1 × 1012 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert Milliwatt to Gigawatt

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Conversion factors verified against NIST, BIPM, ISO 80000-4 Based on SI base units (W = J/s, BIPM). Last reviewed: April 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.

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